document.write( "Question 420113: A swimming pool can be filled with three different hoses. The first hose takes 4 hours to fill the pool. The second hose takes 12 hours to fill the pool and the third hose takes 3 hours to fill the pool. How long would it take if all three hoses were used at the same time? \n" ); document.write( "
Algebra.Com's Answer #293671 by mananth(16946)\"\" \"About 
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Filling the tank is one job
\n" ); document.write( "One pipe fills in 4 hours
\n" ); document.write( "It does 1/ 4 of the job in 1 hours
\n" ); document.write( "other pipe 12 hours
\n" ); document.write( "It does 1/12 of thejob in 1 hours
\n" ); document.write( "third hose takes 3 hours
\n" ); document.write( "It does 1/3 of the job in 1 hour
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\n" ); document.write( "Together they will do 1/4 + 1/12 + 1/3
\n" ); document.write( "Together they will do 2/ 3 of the job in one hour
\n" ); document.write( "So they will take 1 1/2 hours
\n" ); document.write( "So they will take 1.5 hours
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